dart-out

PUBLIC HEALTH

noun A popular back formation from the verbal form–to dart out–for a child who runs into a street with moving motor vehicles–MVs, often chasing a ball.

In the typical case, the child is undetected until directly in front of the MV, as he/she is hidden from view by parked vehicles and tall stationary objects.

Darting out is a common cause of accidents and fatalities in children age 5-10; younger children are more often run over by a parent backing a car out of the driveway.

Synonyms Child darting-out, darting-out accident, darting-out phenomenon 

Reference http://www.legalmatch.com/law-library/article/motorist-negligence-in-child-dart-out-cases.html